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// thread_pool.cpp
#define WORKER_TASK_PROC(name) isize name(void *data)
typedef WORKER_TASK_PROC(WorkerTaskProc);
struct WorkerTask {
WorkerTask * next;
WorkerTaskProc *do_work;
void * data;
};
struct ThreadPool {
gbAllocator allocator;
BlockingMutex mutex;
Condition task_cond;
Slice<Thread> threads;
WorkerTask *task_queue;
std::atomic<isize> ready;
};
void thread_pool_init(ThreadPool *pool, gbAllocator const &a, isize thread_count, char const *worker_name) {
pool->allocator = a;
mutex_init(&pool->mutex);
condition_init(&pool->task_cond);
slice_init(&pool->threads, a, thread_count);
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_init(t);
}
}
void thread_pool_destroy(ThreadPool *pool) {
condition_broadcast(&pool->task_cond);
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_join(t);
}
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_destroy(t);
}
gb_free(pool->allocator, pool->threads.data);
condition_destroy(&pool->task_cond);
mutex_destroy(&pool->mutex);
}
bool thread_pool_queue_empty(ThreadPool *pool) {
return pool->task_queue == nullptr;
}
WorkerTask *thread_pool_queue_pop(ThreadPool *pool) {
GB_ASSERT(pool->task_queue != nullptr);
WorkerTask *task = pool->task_queue;
pool->task_queue = task->next;
return task;
}
void thread_pool_queue_push(ThreadPool *pool, WorkerTask *task) {
GB_ASSERT(task != nullptr);
task->next = pool->task_queue;
pool->task_queue = task;
}
bool thread_pool_add_task(ThreadPool *pool, WorkerTaskProc *proc, void *data) {
GB_ASSERT(proc != nullptr);
mutex_lock(&pool->mutex);
WorkerTask *task = gb_alloc_item(permanent_allocator(), WorkerTask);
if (task == nullptr) {
mutex_unlock(&pool->mutex);
GB_PANIC("Out of memory");
return false;
}
task->do_work = proc;
task->data = data;
thread_pool_queue_push(pool, task);
pool->ready++;
mutex_unlock(&pool->mutex);
condition_signal(&pool->task_cond);
return true;
}
THREAD_PROC(thread_pool_thread_proc) {
ThreadPool *pool = cast(ThreadPool *)thread->user_data;
for (;;) {
mutex_lock(&pool->mutex);
while (pool->ready > 0 && thread_pool_queue_empty(pool)) {
condition_wait(&pool->task_cond, &pool->mutex);
}
if (pool->ready == 0 && thread_pool_queue_empty(pool)) {
mutex_unlock(&pool->mutex);
return 0;
}
WorkerTask *task = thread_pool_queue_pop(pool);
mutex_unlock(&pool->mutex);
task->do_work(task->data);
if (--pool->ready == 0) {
condition_broadcast(&pool->task_cond);
}
}
}
void thread_pool_wait(ThreadPool *pool) {
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_start(t, thread_pool_thread_proc, pool);
}
Thread dummy = {};
dummy.proc = thread_pool_thread_proc;
dummy.user_data = pool;
thread_pool_thread_proc(&dummy);
for_array(i, pool->threads) {
Thread *t = &pool->threads[i];
thread_join(t);
}
}
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